ZF-3809: Update documentation with additional info

Description

Catch-all issue for documentation issues.

Comments

As part of this issue, reiterate in documentation that the DbSelect adapter only selects the required rows

Also would be nice to add info for alternate template engines, like Smarty.

All dependencies for this issue have been resolved.

There should also be a mention of the new TableSelect adapter

Added info about user parameters and DbTableSelect.

Added information about Paginator database adapters and using it with alternate template engines such as Smarty.